Few days ago, while I was changing tyres, car jack broke down, and my car fell off the jack. Lucky me, wheel was still on the car, so no damage occured.

I used the jack only 20 times or so, and long screw had worn down completly.

Now I bought hydraulic car jack.

Be carefull with Dacia car jack!

We know about this issue. In fact, most Logans from that period (2004 as I see in your signature) had this problem. Here in Romania a recall was made which fixed two things: the car jack (changed with a modified model) and for 1.6MPI engines the ECU was updated.

Can I ask you what are you doing with that since you used 20 times that car jack. I had a Logan for two years, 35000km and never used the car jack?

There was no recall in Serbia for car jack nor for ECU updating. Why was ECU updated? What were benefits?

I use jack in late autumn and early spring for changing winter and summer tires

As far as I can tell there were some misfire problems due to faulty ECU software.

Yes.

I had no problems with misfire.